共 13 条
[5]
Kanwal R.P., 1989, Int. J. Math. Educ. Sci. Technol., V20, P411
[8]
Sezer M, 1994, International Journal of Mathematical Education in Science and Technology, V25, P625, DOI [10.1080/0020739940250501, DOI 10.1080/0020739940250501]
[9]
Singh R. P., 2010, Int. J. Contemp. Math. Sci. 1, V1, P83